This Polaris was bought new by my family and has been a reliable machine in all respects. The only so-called major repair was the dealer replaced the drive belt many moons ago. Not bad. It has developed a condition where it gets to part throttle and the motor will not increase in RPM. Similar to a rev limiter in a car, but no backfiring at all. Checked the compression and it was 60 psi. been reading opinions that say it shouldn't be running on other groups. Well it did run and pull hills. All the same I chose to tear it down and install a Namura piston with rings and followed Namura's instructions. The standard bore was in good shape and only required some honing to clean it up and break the glaze. Put it all back together and rode it all over our 45 acre ranch to seat the rings. Anyway compression is increasing little by little daily and it is up to 105 psi. Rings are still bedding in I am not concerned about that. No clue what the target compression is. Clymer manual is worthless on so many levels and no mention of the float level setting either.:fuercht: I have the level tangs set at parallel with the gasket surface. Bottom line the motor has gobs of power until it gets to 1/4 throttle movement then stalls out like a rev limiter. So out of curiosity jacked the float level all over the place trying to see if any improvement. Nope not really. Replaced the spark plug several times-but not fouled at all. Decided to put another ignition module on it. No change in behavior. Changed the coil-no change. Ohmed the exciter coil thinking that must be the culprit-nope all in spec. I have pulled out most of what little hair I have, on this beast. Has to be some owner on here that has dealt with this before-at least I hope or get steered in a direction I have not taken. One more thing, the slider in the factory Mikuni has full up and down travel and is not sticking at all. I have gone through that rather simple carb many times over with cleaner and a rubber tipped air nozzle=all passages are open and very clean. Well one more thing the fuel line is wide open and plenty of fuel will whiz out the carb end when taken off. It does have an inline filter that is open as well. Any and all ideas are welcome even if you think you have an off the wall idea-sometimes they work.:smile
Thanks,
Rufus Jr
